Boiler construction



March i 15, 1927.` 1,621,374

v w. F. MCPHEE BOILER CONSTRUCTION y Filed June 28, i923 Patentedll/Iar.15,1927. 1

' Bo'ILEit-'oonsrnucrroim Applicationmeairune 2e, 1923*., serial No".648,324;Y 1- f My invention relates to improvementsin boilerConstructions, and 'consists inthe combina-tions, constructions,"` andarrangel ments herein described and claimed.

-An object of my invention is to provide a device of the type described,which hasnovelfmeans for drawing the gases of combustion downwardlyabout the combustion chamber after they have-passed to the top' Afurther. obgect .ofmy invention is to prmidefa device of the typedescribed in Cil which the flue Which..ca1'i'ies the `gases off,combustionV downwardly from the top of. the combustionV chamberl .isconcentrically disposed around the combustion.` chamber,` whereby theflue acts as a yheat radiating lin.

A 'furthe-r' object of `my invention is to provide a vdevice of the typedescribed in which the combustionV chamber is provided Withcorrugatedvvalls, and in ivhichA the fine that conveys the gases ofcombustion from the comblustion chamber .to thechimneyyis provided withan'ova'hshaped gas conductingpassage, Vwhereby the Walls of thecombustion chambery andthefvvalls of thev flue provide Va relativelyVgreat heat .radiating surface. i i e A. furtherobject o f-myinvention isto provide a device of the type described which has Water receivingmeans disposed .Within the combustion "chamber, thereby providingadditionalivater heating surface tothe .de- V109.

in thefllbvving. specification', and the novel features of the inventionWill be particularly pointed out in the appended claim.

My invention is illustrated in the accom panying drawings forming partof this device,V in Which Y Figure l is a side elevation of the device,portions thereof being broken away.

kFigure 2 is a section lalong the line 2--2 of Figure l, and

Figure 3 is a section along the line I of Figure 2. l

In carrying out my' invention I' provide a Water containing receptacle'l which hasa combustion chamber 2 mounted therein. Thechamber 2 iscentrally disposed in ythe receptacle l, whereby the Water withingthe L;ec'eptacle will entirely surround the cham- L'er 2.

vtion Within the chamber 2.

i In the presenti.,` form lof deviceet-he' y ,Ulsllrlv-:Df"rA'rEs Per ENrfi..erica chamber V2 islfadaptedto burn. coa'lffand is;- thereforeprovided with a .grate construction indicated generally at... Aiireidoor4; is

.carried bythejlreceptacle'l and permits com# municationlfromtheerrteriorz offthe recepl tacle tfol the 'chamberj2, Jl A' tubing 5extends from `theydoorlt to ythefcha'mber. 2 yand'is disposed abovev,the grate; 3. 'Adra-ft or ash door 6 disposed,-V beneathfthe door .itand laid-communication With-the ash-pitf? of ff the clramber 2 by meansof .t'heftu'bing'ad The combustion -chamber f2 v-is :construeted.

so as Vto afford the n'ia'Yii'ni-un. amount of heating surface to the'Water` `within the receptacle if jTorthis endrIvhaveprovidcd the`chamber Withfcorrugated vertical Walls. 9, (see Figure), and Withacorrugated' top. l0,"(see Figure In addition to this I have disposed'flat .'vvater .containing coils" 1:1l

Within `the?interior'ofthechamber 2, (see Figures 2 and 3). shape 'showntin Figure C Sfand. 'have their ends 12 and :13 secured r' innippleswhich in The coils are of the vso turn lare .carried the vWall o fl the4chamber 2.l In Aorder .to.'.provi'de-an easy assembly.

of the Vcoils to the'chamber, 'I provide the nipples oi; vunionsnvith'-,left 'and right-handv Vscrew threads,'t Wherebyitheinipples need but berotated. VVin nemdirectioni to sec-ure fthe coils Vtofthe"nipples lfand`the nipplesto .the ff furnace.. The nipples are in communication with.the Water Acontained by the .receptacle 1;"

and-permitithefwaterto flow linto thezcoils l-1.'It. will bexnotedvfromf Figure 3 that r .A Y x thejendsl?fandllf if-:fthe coilslare;disposedI` other Objeets and adrantaseewill,appear diametriclally.:.opposite 'froin f3 each J*oth er,l

Wherebylany expansion-:ofIthe'icoils dueito'?V heat Willcause the endsofthe coils to more pulling away from the nipples. In this manfirmlyengage With the nipples lll instead of Y ner the jointswhich-secure thecoils to the' are passed directly into the chimney upon leavingy the topofthe combustion chamber. TIt is obvious that a large amount of the heatwill pass With the gases of combustion into the chimney. In the presentform ofl the device I have disposed a flue 15 concentriwhich I amavvare,the gases of combustion Y,

lio

cally With the chamber,k 2, this Hue communi- `eating with thecompartment 1f? bynieans of a pipe= 18. Theflue 15 is integral with thecasingl, and is s aced therefrom, byv lugs 3.0.

It will be noted rom Figure 2 thatthe4 flue;

to the wall of the. receptacle 1, thelue being. l

spaced slightly from the chamberv andreceptacle. The compartment 17;.'isinY communication with the chimney, (not shown) by means of a pipe 19.The chimney will Vdraw the gases of combustion from theV combustionchamber. 2 in the ordinary manner.

` TheV gases, how-ever, will pass through the openings 16, will flowthrough the coils of the flue 15, through the pipe 18, the compartment17, and the pipe 19 before they will pass. into the chimney. In thismanner,

"f the gases are.v moved downwardly through theilue 15, thereby givingup all of the heat to the water in the receptacle 1 through the Y wallsofi-the flue 15.

` various parts ofthe device,

From the foregoing description of the the operation thereof may bereadily understood. Water is conveyed to the receptacle v1 by means of awater inlet pipe 20. and is carried away by means ofthe pipe 21. It isobvious that the receptacle can be used as a steam boiler if desired,the pipe 21 in this instance conveyingsteam vfrom the receptacle insteadof hot Water.

The device is operated in the same manner as is an ordinary furnace. Thecoal or other combustible, material-is passed through the lire door landis deposited on thegrate 3. The ashes which accumulate in the ash pit 7.are removed through the ash door 6 when necessary. The principalladvantage lof this dev-ice over other devices of like construction liesinthe fact that all of the heat is removed from the gases ofcombustion-before the gases pass into the chamber. This isaccomplishedby the flue15 which causes the gasesofcombustion to travel downwardly.In addition to the flue 15, the` device is providedwith the flat watercoils 11, which further aidy in heating. the water within. the

since the walls of thechamber'are corrugated. The device isreadilyassembled, and is not likely to get out of order easily.

`rEhe flue 15 is provided with integral outwardly extending stub pipes31, these pipes projectingthrough the wall of the receptacle 1 (seeFigs. l and 3). Plugs 32 normally close the ends ofl these pipes.y IVhenthe iue needs cleaning, it is merely necessary to remove the plugs 32and insert a flexible wire brush through the different pipes. The brushwill bend in conformance with vthe curvature of the flue, and willquickly remove the soot, etc., that has become lodged in the fiue. AThebottom ofl the compartment 17 opens into anash pit (not shown), the openend being normally closed by a slide 34. y

The floor 35 of the receptacle 1 isdisposed above the draft door 6. Thewater. within the receptacle only surrounds the. combustionl chamberbetween the grate 3 and the top of the chamber. In this manner, theentire body. of water is in contact with surfaces which are beingheated. E

I claim'z.

A device ofthe type described comprising a combustion chamber havingcorrugated walls, a water-containingv receptacle enclosing saidcombustionA chamber, vspiral coils WILLIAMI FRANCIS MCPHEE.

